DE102019112516A1 - Temperature measuring device for a stator of an electrical machine with hairpin or rod wave windings - Google Patents

Abstract

The invention relates to a temperature measuring device (1) for a stator (31) of an electrical machine (30) with hairpin or bar wave windings (32, 33, 34) and for measuring the temperature of the stator (31), comprising: a sensor device ( 2) for measuring the temperature of the stator (31), - a holding device (3) for holding the sensor device (2) on a winding (32) of the stator (31), - the holding device (3) being designed, at least one winding (33, 34) of the stator (31) to reach behind and to lock it in place. Furthermore, the invention relates to an electrical machine (30) with hairpin or bar wave windings and with a temperature measuring device (1).

Description

The invention relates to a temperature measuring device for a stator of an electrical machine with hairpin or bar wave windings, which is used to measure the temperature of the stator. The invention also relates to an electrical machine with hairpin or bar wave windings.

Various winding technologies for the stator of the electrical machines are known for the development of electrical machines, in particular electrical machines for electrical hybrid vehicles and for electrical vehicles or for wheel hub drives.

For example, from the prior art, an arrangement for temperature detection of a stator winding of an electrical machine is shown in FIG DE 10 2013 201 835 A1 known.

In this arrangement, a temperature sensor, which is arranged on a lance, can be inserted in a self-supporting manner between two stator winding sections.

The temperature sensor is arranged in a housing of the electrical machine via a connection conductor alignment element and is also protected by an outer plastic sheath.

Such a design is not suitable for a particularly dense or compact winding, such as the so-called hairpin or bar wave winding, since the gaps between individual winding sections are very small.

In other words, temperature detection is difficult with such windings (hairpin or bar wave winding) because they are very tightly wound or equipped, so that a conventional temperature sensor is not inserted between the windings or the respective wires, or only very poorly and with great effort can.

It is therefore the object of the present invention to provide a temperature measuring device for a stator of an electrical machine with hairpin or bar wave windings and for measuring the temperature of the stator, as well as an electrical machine with hairpin or bar wave windings, which is inexpensive, simple and preferably Permanent and constant thermal connection of a temperature sensor to a hairpin or rod wave winding of a stator is guaranteed.

A further object of the present invention is to specify a temperature measuring device and an electrical machine which compensate for manufacturing and material tolerances and movements due to vibrations and temperature changes.

According to the invention, these objects are achieved by the features of the independent claims. Further advantageous developments are the subject of the dependent claims.

• - eine Sensorvorrichtung zum Messen der Temperatur des Stators, und
• - eine Haltevorrichtung zum Halten der Sensorvorrichtung an einer Wicklung des Stators.

According to the invention, in a first aspect of the present invention, a temperature measuring device for a stator of an electrical machine with hairpin or bar wave windings and for measuring the temperature of the stator comprises:

• a sensor device for measuring the temperature of the stator, and
• - A holding device for holding the sensor device on a winding of the stator.

The holding device is preferably designed to engage behind at least one winding of the stator and to latch onto it.

Expressed again in other words, it is preferred that the holding device is designed to press the sensor device on an outside of the hollow cylindrical stator against a winding or against the winding geometry or insulation paper and on an inside on at least one winding of the hollow cylindrical stator, in particular releasable to snap into place. In this way, an inexpensive, simple and preferably permanent and above all detachable connection of a sensor device to a hairpin or rod wave winding of a stator can be ensured. This also allows manufacturing and material tolerances of a stator and its movements during operation of the electrical machine due to vibrations and temperature changes to be compensated because the sensor device is no longer arranged inside the stator, as in the prior art, but outside. In this way, a constant thermal connection of the sensor device to a hairpin or rod wave winding can also be guaranteed.

The holding device advantageously has a receiving part for the sensor device and / or at least one latching part for latching on at least one winding of the stator and / or at least one positioning part for positioning the temperature measuring device on a winding.

The receiving part is preferably designed and aligned in a first plane and the at least one latching part in a second plane.

It can be provided that the first and second planes intersect, in particular are aligned perpendicular to one another.

It is also advantageous if the holding device has a first and a second end in the axial direction.

The at least one positioning part is preferably arranged at the first end.

Furthermore, it is advantageous if the at least one latching part is arranged, in particular resiliently, at the first end. In this way, a force can be generated with the aid of the resilient design.

The at least one positioning part and the at least one latching part are advantageously spaced from one another in the circumferential direction.

The at least one latching part advantageously has a first and a second end in the radial direction, the at least one latching part preferably being connected with its first end to the receiving part of the holding device, in particular in one piece. A one-piece design facilitates the manufacturing and assembly effort and reduces costs.

Furthermore, it is favorable that the at least one latching part extends away from the receiving part in a cantilevered manner in the radial direction.

It is also advantageous if the at least one latching part has a latching part, in particular a hook, at its second end for engaging behind and latching onto a winding.

The at least one latching part advantageously has a spring element which is arranged between the first and second ends of the latching part in order to use a spring force to press the sensor device against a winding or an insulating paper.

It is also advantageous if the spring element has a sigma-shaped or E-shaped profile, in particular in the second plane. The spring element preferably has the task of generating a force in the second plane, which generates a tensioning force in order to fix the temperature measuring device.

In addition, it can be provided that the holding device comprises two latching parts which are spaced from one another in the circumferential direction.

The at least one positioning part is preferably arranged at the first end of the holding device.

Furthermore, it is preferred that the at least one positioning part extends in the radial direction away from the receiving part of the holding device.

The at least one positioning part is advantageously designed in the shape of a cuboid.

It is also advantageous if the at least one positioning part is integrally connected to the receiving part.

It can also be provided that the holding device comprises two positioning parts which are spaced from one another in the circumferential direction.

It is also conceivable that the two positioning parts are spaced apart from one another in such a way that the sensor device can be arranged between them.

Furthermore, it is possible for the at least one positioning part and the at least one latching part to extend from the receiving part in the same direction, in particular in the same second plane.

The receiving part advantageously has a receiving section, in particular designed as a recess, for receiving the sensor device.

It is also advantageous if the receiving section extends from the first to the second end of the holding device.

It is also advantageous if the temperature measuring device comprises an alignment element which is arranged in the receiving section and aligns the sensor device on a winding of the stator.

In other words, it is preferred that the temperature measuring device comprises an alignment element which is arranged between the holding device and the sensor device in order to exert a force on the sensor device so that the sensor device can be pressed against a winding over a large area.

The alignment element preferably extends along the receiving section.

Furthermore, it can be provided that the alignment element is made from a plastic, in particular from a preferably soft, elastomer material. In this way, a constant thermal connection of the sensor device to a hairpin or rod wave winding can be guaranteed. In other words, the alignment element is designed to be deformed in such a way that the sensor device is always as close as possible to a hairpin or bar-wave winding of an electrical machine is pressed to ensure the largest possible area of the sensor device in contact with a wave winding.

The sensor device preferably comprises a temperature sensor.

It is also preferred that the sensor device comprises a cable connection for connecting a temperature sensor to an evaluation unit.

The cable connection is preferably at least partially connected to the holding device, in particular partially cast in it.

The sensor device advantageously has a first and a second end in the axial direction, the temperature sensor being arranged preferably at the first end and the cable connection being arranged at the second end.

Furthermore, it is advantageous if the sensor device comprises a protective device, in particular a PTFE sheathing, for example in the form of a shrink tube, which encases the temperature sensor, in particular completely, and at least partially encloses the cable connection.

Furthermore, it is advantageous if the sensor device is adapted to a receiving section of the holding device in terms of shape and size. It is of course also possible for the receiving section to be adapted to the geometry of the sensor device.

Finally, it should be noted that it can be provided that the temperature measuring device is made of a plastic.

A second aspect of the present invention comprises an electrical machine with hairpin or bar wave windings.

It is expressly pointed out that the features of the temperature measuring device, as mentioned under the first aspect, can be used individually or in combination with one another in the electrical machine.

In other words, the features mentioned above under the first aspect of the invention relating to the temperature measuring device can also be combined with further features here under the second aspect of the invention.

• - einen hohlzylinderförmigen Stator, insbesondere hergestellt mit Hairpin- oder Stab-Wellenwicklungen, mit mindestens einer Wicklung, und
• - eine Temperaturmesseinrichtung nach dem ersten Aspekt.

An electrical machine with hairpin or bar wave windings preferably comprises:

• - A hollow cylindrical stator, in particular made with hairpin or bar wave windings, with at least one winding, and
• - A temperature measuring device according to the first aspect.

Furthermore, it is preferred that the temperature measuring device with its sensor device is arranged on a first winding and that two latching parts are engaged on a further winding in order to hold the temperature measuring device in position on the stator.

The latching parts preferably have a length such that they extend from the outer circumferential surface of the stator to its inner circumferential surface. In other words, it is advantageous if the locking parts extend through the wall thickness of the hollow cylindrical stator, whereas the temperature measuring device is located on the outside or on the outer jacket surface of the stator.

The inventive idea presented above is additionally expressed in other words below.

This idea preferably consists - in simplified form - of mounting a temperature sensor or a sensor device by means of a clip or a holding device on a hairpin or rod wave winding of a stator.

By means of an alignment element, preferably made of an elastomer, the radial and tangential compensation of manufacturing and material tolerances as well as the compensation of movements due to vibrations and temperature changes is preferably compensated and a permanent and constant thermal connection is ensured. Such a concept is characterized by a particularly simple and safe production.

• 1 eine räumliche Ansicht auf eine erfindungsgemäße Temperaturmesseinrichtung für einen Stator einer elektrischen Maschine;
• 2 eine räumliche Ansicht auf eine Sensorvorrichtung aus 1; und
• 3 bis 6 unterschiedliche Seitenansichten sowie unterschiedliche räumliche Ansichten auf einen Teilausschnitt einer elektrischen Maschine mit einer erfindungsgemäßen Temperaturmesseinrichtung aus 1.

The invention is explained in more detail below using an exemplary embodiment in conjunction with the associated drawings. Here show schematically:

• 1 a three-dimensional view of a temperature measuring device according to the invention for a stator of an electrical machine;
• 2 a three-dimensional view of a sensor device 1 ; and
• 3 to 6th different side views and different spatial views of a partial section of an electrical machine with a temperature measuring device according to the invention 1 .

In the description below, the same reference symbols are used for the same items.

1 shows a three-dimensional view of a temperature measuring device according to the invention 1 for a stator 31 an electrical machine 30th .

Shown more precisely shows 1 a temperature measuring device 1 for a stator 31 an electrical machine 30th with hairpin or rod wave windings 32 , 33 , 34 and for measuring the temperature of the stator 31 .

The temperature measuring device has 1 a sensor device 2 for measuring the temperature of the stator 31 and a holding device 3 for holding the sensor device 2 on a winding 32 of the stator 31 .

The holding device 3 is designed two windings 33 , 34 of the stator 31 to reach from behind and to lock into place (see e.g. 3 to 6th ).

Also shows 1 that the holding device 3 a receiving part 4th for the sensor device 2 , two locking parts 5 , 6th to snap onto a winding 32 of the stator 31 and two positioning parts 7th , 8th for positioning the temperature measuring device 1 on a winding 32 having.

According to 1 are the receiving part 4th in a first level E1 and the two locking parts 5 , 6th in a second level E2 formed and aligned with the first and second planes E1 , E2 are aligned perpendicular to each other.

The holding device 3 has in the axial direction A. a first 9 and a second end 10 , being at the first end 9 the two positioning parts 7th , 8th and the two locking parts 5 , 6th are arranged.

As 1 also see the two locking parts 5 , 6th in the circumferential direction U spaced from each other and each have a first 11 and a second end 12 in the radial direction R. , each locking part 5 , 6th with its first end 11 with the receiving part 4th the holding device 3 is integrally connected.

Each locking part also extends 5 , 6th in the radial direction R. from the receiving part 4th unsupported away, each locking part 5 , 6th at its second end 12 a locking element 13 , designed as a hook, for reaching behind and engaging on a winding 33 , 34 or on an insulating paper of the electrical machine 30th has (cf. also 3 to 6th ).

Between the first 11 and the second end 12 of the locking part 5 , 6th is a spring element 14th is arranged to the sensor device with a spring force 2 against a winding 32 to press.

The spring element 14th has, especially in the second level E2 , a sigma-shaped or E-shaped course. This course can depending on the design of the spring element 14th look different.

Also goes out 1 show that each positioning parts 7th , 8th at the first end 9 the holding device 3 is arranged, each positioning parts 7th , 8th in the radial direction R. from the receiving part 4th the holding device 3 stretches away.

This is how the positioning parts extend 7th , 8th and the locking parts 5 , 6th from the receiving part 4th in the same direction.

Furthermore, the positioning parts 7th , 8th Cuboid and integral with the receiving part 4th connected.

Furthermore, the two positioning parts 7th , 8th the holding device 3 in the circumferential direction U at a distance from one another, namely in such a way to one another or at a distance from one another that the sensor device 2 is arranged.

How also 1 has revealed the receiving part 4th a receiving section 15th , in particular designed as a recess, for receiving the sensor device 2 .

The receiving section 15th extends from the first 9 to the second end 10 the holding device 3 .

Furthermore, in 1 or better in 6th to recognize that the temperature measuring device 1 an alignment element 16 includes that in the receiving portion 15th is arranged and the sensor device 2 on a winding 32 of the stator 31 can align.

So has the temperature measuring device 1 so an alignment element 16 between the holding device 3 and the sensor device 2 to apply a force to the sensor device 2 exercise, so that this over a large area to a winding 32 can be pressed (compare in this context, for example 3 to 6th ).

The alignment element 16 extends along the receiving portion 15th and is made of an elastomer material.

2 shows a three-dimensional view of the sensor device 2 out 1 .

Here the sensor device has 2 a temperature sensor 17th and a cable connector 18th for connecting the temperature sensor 17th with an evaluation unit. This connection between temperature sensor 17th and cable connection 18th takes place preferably by means of conventional connection technology, for example by means of welding or crimping the temperature sensor 17th and the required cable connection 18th .

With the temperature sensor 17th it can be an NTC or PTC resistor element.

The cable connection 18th is partially with the holding device 3 connected or partially cast in this (compare 1 second end 10 the holding device 3 ).

Also the sensor device 2 has a first 19 and a second end 20th in the axial direction A. , being at the first end 19th the temperature sensor 17th and at the second end 20th the cable connection 18th are arranged.

The sensor device also has 2 a protective device 21st , in particular a PTFE sheathing, for example in the form of a shrink tube, which the temperature sensor 17th completely and partially the cable connection 18th enveloped.

So that the sensor device 2 in the receiving section 15th the holding device 3 can be arranged, this is in terms of shape and size on the receiving portion 15th customized. It is of course also possible that the receiving section 15th to the geometry of the sensor device 2 is adapted.

In conclusion, be closed 1 still noted that the temperature measuring device 1 is made of a plastic.

3 to 6th each show different side views and different spatial views of a partial section of an electrical machine 30th with a temperature measuring device according to the invention 1 out 1 .

In fact, they show 3 to 6th an electric machine 30th with hairpin or rod wave windings.

The electric machine 30th has a hollow cylindrical stator 31 made with hairpin or rod wave windings 32 , 33 , 34 , with several, especially three windings 32 , 33 , 34 .

Here is the temperature measuring device 1 from the 1 and 2 on the stator 31 arranged.

Of further statements regarding the temperature measuring device 1 is disregarded at this point and the statements above on the 1 and 2 referenced, which are applicable here analogously.

As already to 1 executed, the temperature measuring device 1 a sensor device 2 for measuring the temperature of the stator 31 and a holding device 3 for holding the sensor device 2 on a winding 32 of the stator 31 .

In other words, again, is the holding device 3 formed, the sensor device 2 on an outside AS of the hollow cylindrical stator 31 against a winding 32 to press and on an inside IS on multiple winding 33 , 34 of the hollow cylindrical stator 31 releasably lock into place.

Like the one in particular 3 and 4th the temperature measuring device can be seen 1 with their sensor device 2 on a first winding 32 arranged, with two locking parts 5 , 6th on each other winding 33 , 34 are locked to the temperature measuring device 1 in position on the stator 31 to keep.

The locking parts have 5 , 6th such a length that it extends from the outer jacket surface AS of the stator 31 towards its inner surface IS extend, whereby the locking elements 13 on the winding 33 , 34 are locked.

The following are the featured 1 to 6th again described in other words.

Here, the basic idea of the inventive solution is preferably in 3 shown.

In this the sensor device 2 from a clip or from the holding device 3 , which is locked into a hairpin or rod wave winding and moves through a soft element or the aligning element 16 , e.g. B. an elastomer, to the outer geometry of the winding 32 evenly.

The structure of the inventive solution is for example in 1 shown.

The connections or the cable connection 18th the sensor device 3 are preferably connected to signal lines or cables using connection technology (e.g. welding, crimping process, etc.).

The clip or the temperature measuring device 1 is can be a plastic injection molded part, which is based on the geometry of the winding. This clip 1 additionally has in the receiving section 15th the holding device 3 , please refer 6th , an elastomer or an alignment element 16 which has the task of compensating for radial tolerances and the temperature sensor 17th or the entire sensor device 2 to press against a winding.

This alignment element 16 is either positioned afterwards or is already with the holding device from the start 3 manufactured.

The elastomer or the alignment element 16 , which is located between the temperature measuring device 1 and the sensor device 2 is located, the radial tolerance compensation is improved by the temperature sensor 17th or the sensor device 2 on the winding and against the alignment element 16 is pressed.

The material of the alignment element 16 should preferably be selected so that it can be pressed with little pressure and again when the temperature measuring device is removed 1 goes to the starting position to be repositioned later.

For mounting the temperature measuring device 1 to the geometry of the hairpin or bar wave winding 32 serve additional webs or positioning parts 7th , 8th for guidance and angular orientation.

When the final assembled temperature measuring device 1 to the hairpin or rod wave winding 32 is pressed, see 3 to 6th , there is an external force influence radially outwards.

Now have the positioning parts 7th , 8th preferably the task of the temperature measuring device 1 through the hairpins until they are in their final position, through the fixing hooks or locking elements 13 , locked.

Until this happens, the sensor device pushes 3 against the soft elastomer or against the alignment element 16 . Thus, the temperature measuring device is in the end position 1 an optimal connection of the temperature sensor 17th or sensor device 2 and hairpin or bar wave winding 32 one.

List of reference symbols

1

Temperature measuring device

2

Sensor device

3

Holding device

4th

Receiving part

5

Locking part

6

Locking part

7th

Positioning part

8th

Positioning part

9

first end of the holding device

10

second end of the holding device

11

first end of the locking part

12

second end of the locking part

13th

Locking element

14th

Spring element

15th

Receiving section

16

Alignment element

17th

Temperature sensor

18th

Cable connection

19th

first end of the sensor device

20th

second end of the sensor device

21st

Protective device

30th

electric machine

31

stator

32

Winding

33

Winding

34

Winding

A.

axial direction

R.

radial direction

U

Circumferential direction

E1

first level

E2

second level

AS

Outside

IS

inside

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102013201835 A1 [0003]

Claims (10)

Temperature measuring device (1) for a stator (31) of an electrical machine (30) with hairpin or bar wave windings (32, 33, 34) and for measuring the temperature of the stator (31) having: - a sensor device (2) for measuring the temperature of the stator (31), - A holding device (3) for holding the sensor device (2) on a winding (32) of the stator (31), - wherein the holding device (3) is designed to reach behind at least one winding (33, 34) of the stator (31) and to latch onto it. Temperature measuring device according to Claim 1 - wherein the holding device (3) is designed to press the sensor device (2) on an outside (AS) of the hollow cylindrical stator (31) against a winding (32) and on an inside (IS) on at least one winding (33, 34) of the hollow cylindrical stator (31), in particular releasably, to engage. Temperature measuring device according to Claim 1 or 2 - wherein the holding device (3) • a receiving part (4) for the sensor device (2) and / or • at least one latching part (5, 6) for latching on at least one winding (32) of the stator (31) and / or • has at least one positioning part (7, 8) for positioning the temperature measuring device (1) on a winding (32), - wherein preferably the receiving part (4) in a first plane (E1) and the at least one latching part (5, 6) in a second plane (E2) is formed and aligned, - the first and second planes (E1, E2) preferably intersecting, in particular being aligned perpendicular to one another. Temperature measuring device according to Claim 3 - wherein the holding device (3) has a first (9) and a second end (10) in the axial direction (A), - the at least one latching part (5, 6), in particular resiliently, preferably at the first end (9), is arranged - wherein the at least one positioning part (7, 8) is preferably arranged at the first end (9). Temperature measuring device according to one of the preceding claims and according to Claim 3 - the at least one latching part (5, 6) having a first (11) and a second end (12) in the radial direction (R), - wherein the at least one latching part (5, 6) preferably has its first end (11 ) is connected to the receiving part (4) of the holding device (3), in particular in one piece, - the at least one latching part (5, 6) preferably extending in a cantilevered manner in the radial direction (R) from the receiving part (4), - preferably the at least one latching part (5, 6) at its second end (12) has a latching element (13), in particular a hook, for engaging behind and latching onto a winding (32), with the at least one latching part (5, 6) preferably being a Has spring element (14) which is arranged between the first (11) and second end (12) of the latching part (5, 6) in order to press the sensor device (2) against a winding (32) with a spring force. Temperature measuring device according to one of the preceding claims and according to Claim 3 - the at least one positioning part (7, 8) being arranged at the first end (9) of the holding device (3), - the at least one positioning part (7, 8) preferably extending in the radial direction (R) from the receiving part (4) extending away from the holding device (3), the at least one positioning part (7, 8) preferably being cuboid, the at least one positioning part (7, 8) preferably being connected in one piece to the receiving part (4). Temperature measuring device according to one of the preceding claims and according to Claim 3 or 4th - the receiving part (4) having a receiving section (15), in particular designed as a recess, for receiving the sensor device (2), - wherein the receiving section (15) preferably extends from the first (9) to the second end (10) of the holding device (3), - wherein the temperature measuring device (1) preferably comprises an alignment element (16) which is arranged in the receiving section (15) and aligns the sensor device (2) on a winding (32) of the stator (31), - preferably the alignment element (16) is made from a plastic, in particular from an elastomer material. Temperature measuring device according to one of the preceding claims, - wherein the sensor device (2) comprises a temperature sensor (17), - wherein the sensor device (2) preferably comprises a cable connection (18) for connecting a temperature sensor (17) to an evaluation unit, - preferably the Cable connection (18) is at least partially connected to the holding device (3), in particular is partially cast in it, - the sensor device (2) preferably having a protective device (21), in particular a PTFE sheathing, for example in the form of a shrink tube, which encloses the temperature sensor (17), in particular completely, and at least partially encloses the cable connection (18). Electrical machine (30) with hairpin or rod wave windings having: - a hollow cylindrical stator (31), in particular made with hairpin or bar wave windings (32, 33, 34), with at least one winding (32, 33, 34), - A temperature measuring device (1) according to one of the preceding claims. Electric machine after Claim 9 - wherein the temperature measuring device (1) with its sensor device (2) is arranged on a first winding (32) and two locking parts (5, 6) are engaged on a further winding (33, 34) in order to enable the temperature measuring device (1) to hold in position on the stator (31), - the locking parts (5, 6) preferably having a length such that they extend from the outer jacket surface (AS) of the stator (31) to its inner jacket surface (IS).

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